Sharp MX-LCX1 (serv.man2) Service Manual ▷ View online
MX-LCX1 OUTSIDE VIEW AND INTERNAL STRUCTURE 4 – 1
Service Manual
[4] OUTSIDE VIEW AND INTERNAL STRUCTURE
1. Part Names and Functions
A. Internal Structure
No.
Name
1
Pick-up roller
2
Paper feed roller
3
Transport roller
4
Reverse roller
3
4
2
1
MX-LCX1 OUTSIDE VIEW AND INTERNAL STRUCTURE 4 – 2
B. Sensors and Switches
No.
Signal
Name
Type
Function/operation
Activation condition
1
LDD
Tray lower limit sensor
Transmission
type
type
This sensor detects when the tray has
reached its lower limit.
reached its lower limit.
The signal becomes High level when the tray is
at its lower limit.
at its lower limit.
2
LRE
Lift motor encoder sensor
Transmission
type
type
This sensor detects when the lift motor
rotates.
rotates.
Pulse signal.
3
LCD
Tray insertion sensor
Transmission
type
type
This sensor detects when the tray is
inserted.
inserted.
The signal becomes High level when the tray is
inserted.
inserted.
4
LTOD
Main unit connection sensor
Transmission
type
type
This sensor detects when the paper feeder is
connected to the main unit.
connected to the main unit.
The signal becomes Low level when connected
to the main unit.
to the main unit.
5
LPFD
Transport sensor
Transmission
type
type
This sensor detects when paper is
transported.
transported.
The signal becomes Low level when paper is
transported (when paper exists).
transported (when paper exists).
6
LUD
Tray upper limit sensor
Transmission
type
type
This sensor detects when the tray has
reached its upper limit.
reached its upper limit.
The signal becomes High level when the tray is
at its upper limit (with the lift-up motor stopped).
at its upper limit (with the lift-up motor stopped).
7
LPED
Paper-on-tray sensor
Transmission
type
type
This sensor detects whether there is paper in
the tray.
the tray.
The signal becomes Low level when paper is in
the tray.
* When the tray is being lifted up and this
the tray.
* When the tray is being lifted up and this
signal is at Low level with the LRE signal not
exceeding 800 pulses, the paper feed
solenoid turns ON.
exceeding 800 pulses, the paper feed
solenoid turns ON.
8
LLSW
Upper limit switch
Microswitch
This limit switch is intended to prevent the
tray from overrunning the upper limit and
breaking the paper feed unit.
tray from overrunning the upper limit and
breaking the paper feed unit.
–
9
LDSW
Upper door latch switch
Microswitch
This switch detects when the upper door is
opened or closed.
opened or closed.
–
1
2
3
4
5
8
6
7
9
MX-LCX1 OUTSIDE VIEW AND INTERNAL STRUCTURE 4 – 3
C. Drive and Control Components
No.
Signal
Name
Type
Function/operation
Activation condition
1
LPFM
LCC transport motor
–
This motor drives the paper feed
and transport sections.
and transport sections.
The signal becomes High level when paper feed is
started.
started.
2
LLM
LCC lift motor
Brush motor
This motor raises the paper feed
table.
table.
The signal is High level when the motor is working;
when the upper limit sensor turns ON, the motor
stops and the signal becomes Low level.
when the upper limit sensor turns ON, the motor
stops and the signal becomes Low level.
3
LTRC
LCC transport
clutch
clutch
Electromagnetic
clutch
clutch
This clutch controls the ON/OFF
status of the transport roller.
status of the transport roller.
–
4
LPFC
LCC paper feed
clutch
clutch
Electromagnetic
clutch
clutch
This clutch controls the ON/OFF
status of the paper feed roller.
status of the paper feed roller.
The signal becomes High level when paper feed is
started;
the clutch is turned OFF by a timer after transport
is started (with the pick roller turned OFF).
started;
the clutch is turned OFF by a timer after transport
is started (with the pick roller turned OFF).
5
LPFS
LCC paper feed
solenoid
solenoid
Electromagnetic
solenoid
solenoid
This solenoid presses the paper
pick-up roller onto the paper.
pick-up roller onto the paper.
The solenoid is turned OFF after transport is
started and, when the time is up, it is turned ON
again.
The solenoid is ON between lift-up and the
activation of the Paper-on-tray sensor.
started and, when the time is up, it is turned ON
again.
The solenoid is ON between lift-up and the
activation of the Paper-on-tray sensor.
6
LCC MAIN PWB CR
LCC main board CR
–
Controls and drives LCC.
–
7
DH (Service parts (kit):
When installing, refer
to [11].)
When installing, refer
to [11].)
LCC heater
–
This heater is used to keep
warm the LCC tray interior.
warm the LCC tray interior.
–
1
6
2
3
4
5
7
MX-LCX1 OPERATIONAL DESCRIPTIONS 5 – 1
Service Manual
[5] OPERATIONAL DESCRIPTIONS
1. Lift Operation
When the power to the main unit is turned ON with the tray at a
midway position (that is, a position where both the upper limit sen-
sor [LUD] and lower limit sensor [LDD] are OFF) or with the tray at
the lower limit position (where the lower limit sensor LDD is ON),
the main unit issues a lift-up request and, in response, the lift motor
is turned ON to lift the tray.
If the Paper-on-tray sensor (LPED) turns ON within 800 encoder
pulses of the start of tray lift, the lift motor is temporarily turned OFF
to stop the tray, and then the paper feed solenoid is turned ON to
lower the pick roller. Subsequently, the lift motor is turned ON, and
the tray is lifted to and stopped at a position where the upper limit
sensor (LUD) is turned ON.
If the Paper-on-tray sensor (LPED) does NOT turn ON within 800
pulses of the start of tray lift, the paper feed solenoid is turned ON
with the lift motor remaining ON, and the pick roller is lowered. The
lift motor stops when the tray reaches a position where the upper
limit sensor (LUD) is turned ON, and subsequently the paper feed
solenoid is turned OFF.
Lift operation is not performed if the power to the main unit is turned
ON with the tray at a position where it can feed paper.
When the tray is drawn out, it lowers by its own weight.
midway position (that is, a position where both the upper limit sen-
sor [LUD] and lower limit sensor [LDD] are OFF) or with the tray at
the lower limit position (where the lower limit sensor LDD is ON),
the main unit issues a lift-up request and, in response, the lift motor
is turned ON to lift the tray.
If the Paper-on-tray sensor (LPED) turns ON within 800 encoder
pulses of the start of tray lift, the lift motor is temporarily turned OFF
to stop the tray, and then the paper feed solenoid is turned ON to
lower the pick roller. Subsequently, the lift motor is turned ON, and
the tray is lifted to and stopped at a position where the upper limit
sensor (LUD) is turned ON.
If the Paper-on-tray sensor (LPED) does NOT turn ON within 800
pulses of the start of tray lift, the paper feed solenoid is turned ON
with the lift motor remaining ON, and the pick roller is lowered. The
lift motor stops when the tray reaches a position where the upper
limit sensor (LUD) is turned ON, and subsequently the paper feed
solenoid is turned OFF.
Lift operation is not performed if the power to the main unit is turned
ON with the tray at a position where it can feed paper.
When the tray is drawn out, it lowers by its own weight.
2. Paper Feed Operation
Paper feed operation can be performed if the tray is stationary at a
position where it can feed paper (with the upper limit sensor [LUD]
being ON) and there is paper in the tray.
When paper feed takes place, the transport motor (LPFM), the
transport clutch (LTRC), the paper feed clutch (LPFC), and the
paper feed solenoid (LPFS) operate with the following timings:
position where it can feed paper (with the upper limit sensor [LUD]
being ON) and there is paper in the tray.
When paper feed takes place, the transport motor (LPFM), the
transport clutch (LTRC), the paper feed clutch (LPFC), and the
paper feed solenoid (LPFS) operate with the following timings:
When the transport clutch (LTRC) turns ON with the transport
motor (LPFM) is ON (rotating), the transport roller starts rotating.
When the paper feed clutch (LPFC) turns ON in this state, the
paper feed and take-up rollers start rotating.
When the paper feed solenoid (LPFS) turns ON, the take-up roller
is pushed down to press paper.
motor (LPFM) is ON (rotating), the transport roller starts rotating.
When the paper feed clutch (LPFC) turns ON in this state, the
paper feed and take-up rollers start rotating.
When the paper feed solenoid (LPFS) turns ON, the take-up roller
is pushed down to press paper.
Paper feed time chart (with acceleration)
*1:
Operation stops only if the main unit synchronization signal is output.
When operation is stopped, the ON/OFF timing for each load is delayed by the stoppage time because each timer is suspended during the
stoppage.
To ensure efficient job processing, operation is not stopped under normal conditions.
Operation stops only if the main unit synchronization signal is output.
When operation is stopped, the ON/OFF timing for each load is delayed by the stoppage time because each timer is suspended during the
stoppage.
To ensure efficient job processing, operation is not stopped under normal conditions.
Lift operation (where LPED turns ON within 800 encoder
pulses of the start of lift operation)
pulses of the start of lift operation)
(lift motor output)
(lower limit sensor)
(upper limit sensor)
(paper-on-tray sensor)
(solenoid)
(encoder signal)
200 msec
Within 800 pulses
LDD
LLM
LUD
LPED
LPFS
LRE
Lift operation (where LPED does NOT turn ON within 800
encoder pulses of the start of lift operation)
encoder pulses of the start of lift operation)
(lift motor output)
(lower limit sensor)
(upper limit sensor)
(paper-on-tray sensor)
(solenoid)
(encoder signal)
LDD
LLM
LUD
LPED
LPFS
LRE
800
Accelerating speed
Start of job
Catch-up control
Catch-up control
Clearance-between-papers
control timer
control timer
Clearance-between-papers
control timer
control timer
PIC timer
Paper feed clutch
OFF timer
OFF timer
Start of 1st
paper feed
paper feed
Start of 2nd
paper feed
paper feed
Start of 3rd
paper feed
paper feed
Paper feed clutch
OFF timer
OFF timer
PIC timer
Process speed
LPFM
(transport
motor)
(transport
motor)
LPFD
(transport
sensor)
(transport
sensor)
LPFC
LTRC
(paper feed
clutch)
clutch)
(transport
clutch)
clutch)
TRC
(main unit
synchronization
signal)
(main unit
synchronization
signal)
LPFS
(paper feed
solenoid)
(paper feed
solenoid)
suspended
on
off
off
on
off
off
on
off
off
on
off
off
on
off
off
*1
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